Compounding alternators.



No. 7l7,277. Pa'tented Dec. 30, I902.

E. w. mes, IR. CDMPUUNDING ALTERNATOBS.

(Applicatibn filed June 8, 1900.)

(No Model.)

Witnesses Jnventor.

m: uoams "Tans co, NO:I'O-LITHO., WASHINGTON. 0.4:.

UNITED STATES ATENT OFFICE.

EDWIN 7. RICE, JR., OF SCHENEOTADY, NEW YORK, ASSIGNOR TO THE GENERALELECTRIC COMPANY, A CORPORATION OF NEW YORK.

COMPOUNDING ALTERNATORS.

SPECIFICATION forming part of LetterslPatent No. 717,277, dated December30, 1902 Application filed June 8,1900. Serial No. 19,529. (No model.)

..0 ml], whom, it may concern: Be it known that I, EDWIN W. RICE, Jr., acitizen of the United States, residing at Schenectady, county ofSchenectady, State of New York, have invented certain new and usefulImprovements in Compounding Alternators, (Case No. 1,114,) of which thefollowing is a specification.

My present invention relates to the regulation of dynamo-electricmachines, and more particularly to the regulation of analternating-current generator or other source of energy-feeding currentthrough a reactive transmission-line to some receiving-circuit.

In carrying out my invention I set up at the generating end of the linean electromotive force which is arranged to vary in the same proportionas the variation of electromotive force at the end of the line, and theelectromotive force which I thus set up I employ to regulate theimpressed electromotive force of the generator.

My invention will better be understood by reference to the followingdescription, taken in connection with the accompanying drawing. Itsnovel features I will point out in the claims appended hereto.

In the drawing I have shown a generator at .1, connected toand feedingreactive transmission-lines 3 4:. In the particular embodiment of theinvention which I have herein shown this generator is provided with twofield-windings, (indicated,respectively, at 5 and 6,) thesefield-windings being arranged to act in opposition to each other. Thewinding 5 is excited from any suitable source of direct currentsuch,forexample,as an exciter 7the electromotive force of which may be regulatedin the usual manner by means of a field-rheostat. The winding 6, which Iterm a regulatingwinding, is supplied with current from thedirect-current side of a rotary converter 8, the alternatingcurrentterminals of which are connected in series with two transformersecondaries 9 and 10, the primary ll of one of the transformers beingshunted about a combination of resistance and inductance 12 representingin miniature these factors in the transmission-line, while the primary13 is shunted across the transmitting'end ot' the lines 3 4. In thiscase the transmission-line is supposed to contain only resistances andinductances, for which reason I have shown at 12 a combination ofresistances and inductances, having the same relation to each other asthe resistances and inductances in the transmissionline, but on asmaller scale. It will be evident, however, that if thetransmission-line contains capacity the arrangement of the artificialline 12 may be varied to correspond. Owing to the fact that theartificial line 12 represents the transmission-line in miniature, itwill be evident that the electromotive force or drop between itsterminals will on a small scale represent the actual drop in potentialin the transmission-lines. By combining the electromotive force set upin the secondary 9 with the electromotive force set up in the secondary10 it will be evident, if suitable ratios of transformation arechosen inthese transformers, that the resultant electromotive force willrepresent that which exists at the receiving end of the line. Theelectromotive force of the secondary 9 should have the same relation tothat of the secondary 10 as the drop in the line has to the impressedelectromotive force.

The resultant electromotive force derived from the .secondaries 9 and10, being impressed upon the rotary converter 8, gives rise to a directcurrent in the regulatingwinding 6, which varies in proportion to thevariation of electromotive force at the receiving endof the line. Thewinding 6, being connected into circuit so as to be in opposition in itseifect to the winding 5, will decrease the resultant field strength whenthe electromotive force at the receiving end of the line rises andincrease the field strength when the receiving electromotive forcefalls,thereby causing the electromotive force of the generator to varyin such a manner as will preserve a constant electromotive force at thereceiving end of the line or at some other selected point on the system.

Instead of using a rotary converter forthe purpose specified I'may,iffound desirable, employ a rectifying-commutator, and this, as

well as other modifications, may be made without departing from thespirit of my invention. 7

What 1 claim as new, and desire to secure by Letters Patent of theUnited States, is

1. The method of regulating an alternating-current dynamo-electricmachine feeding a reactive circuit, which consists in setting up analternating current having an electromotive force which varies in thesame proportion as the variation of electromotive force at the receivingend of the circuit or at some other chosen point on the circuit,deriving therefrom a direct current, and utilizing said direct currentfor regulating said dynamoelectric machine;

2. The method of regulating a dynamoelectric machine feeding a reactiveelectric circuit which consists in setting up at the transmitting end ofthe circuit an electroniotive force representing to a suitable scale theelectromotive force at the receiving end of the circuit or at some otherselected point of the system, and utilizing the electromotive force'thusset up to regulate said dynamoelectric machine.

3. The method of regulating a dynamoelectric machine feeding a reactiveelectric circuit which consists in setting up at the transmitting end ofthe circuit an alternating electromotive force representing to asuitable scale the electromotive force at the receiving end of thecircuit or at some other selected point of the system, deriving from theelectromotive force thus set up a direct current, and passing saiddirect current through a winding on said dynamo-electric machine.

' 4- The method of regulating a dynamoelectric machine feeding areactive electric circuit, which consists in setting up at thetransmitting end of the circuit an alternating electromotive forcerepresenting to a suitable scale the electromotive force at the re-"ceiving end of the circuit or at some other selected point of thesystem, deriving from the electromotive force thus set up a directcurrent, and utilizing said direct current for purposes of regulation.

' In witness whereof I have hereunto set my hand this 2d day of June,1900.

EDWIN W. RICE, JR.

Witnesses:

BENJAMIN B. HULL, MABEL H. EMERSON.

